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UNITED STATES PATENT Ormea.

JOHN e. WOODWARD, oF sr. JOHN, NEW'BRUN'SWIGK.

VENTILA'TING APPARATUS FOR 'STEAlV-V'ESSELS, 86C.

Spcieation forming partof Letters Patent No. 50,434, dated October 10,186i making part of this specification, 4wherein I have represented avertical section of said vventilatin, apparatus as fitted into a vessel.

Great diiculty isl experienced in the ventilation of engine and firerooms on board of 'steam boats and ships in consequence of the confinedspace and great heat Vradiated from the boilers and furnaces.lWind-sails and canvas tubes have been employed, and alsoventilating-pipes; but still the temperature upon many steamboats,gunboats, monitors, and sea-going stearnships is so great that'theengineersand firemen are often prostrated, and

are obliged to come upon decl; frequently to enable them to continuetheir duties. Besides this, the dust, sparks, and ashes very often blowabout'thetire and engine rooms, particularly` when-the doors are openedibrcharging or raking the tires; and` when it becomes necessary to drawout the res and extinguishthe coals the heat, dust, steam, and dirt arevery inconvenient and oppressive.

The nature of my said invention-consists in a Ventilating-casingsurronndingor contiguous to the smoke-pipe or funnel through which airis drawn from the engine and re rooms by the column of air ascending bybeing warmed by the smoke-pipe. This current of air taken from theengine-room conveys away any noxious gases, dust, vapors, and also theheated air, and in place. thereof the cool air will descend by a naturalaction through the hatchways, thus rendering the engine-room of anagreeable temperature, and'A this systemof ventilation may be extendedby pipes to the other' portions of the vessel. I also carry the saidVentilating-case up above the top end of the smoke-pipe or funnel of theboilers, in order that the ascending ventilating-current of air-mayincrease the draft of air passing through the furnace.

In the drawings, a represents the bottom of the vessel, or one of thedecks. b represents the other deck. (lisa boiler of any usual or desiredconstruction, andv e is the smoke-pipe or funnel, as usual. fis a casingsurrounding y the funnel and extending from 4the deck iinmediately abovethe'boiler to the top of and slightly above the said smoke-pipe. Thespace between this easing fand the smoke-pipe becomes an annularventilator,'that takes up all dust, vapors, heated air, duc., with apowerful circulating` current induced by the heatof the smoke-pipe, and,passing above the upper end of said smoke-pipe, aids the draft to thetiresby promoting the escape of theprodncts'of combustion freni this endof said pipe. The

annular Ventilating-space is connected at its lower end in anyconvenient'manner by a cas-l ing or pipes with the parts of the vesselto be ventilated. v

In the drawings the smoke-pipe is shown at .the furnace end of theboilerand a partition or hood, h, extendingdown near the front of thefurnace to a short distance. above the tiredoors, serves to direct thecirculating current ot' air in such a manner as to convey away all dust'and vapors and -prevent the'heat from coming into the engine-room.

I have represented a casing, i, inadein sections, so that it can beremoved, surrounding the boiler, leaving an air-space between itself andthe boiler, the object of which is to retain heat and prevent theVentilatingcurrent'of air cooling the boiler too ^much. This casing isto be retained in place by hoops ruiming around the boiler, the metallicplat'esrunning lengthwise of said boiler, and, if preferred, openingsmay be left in the casing at the points 1, 2, and 3, so that asmallcirculation of air may be allowed to 'prevent the air becoming too m'ucbheated within the casing t'.

Vhat I claim, and desire to secure by Lett-ers Patent, is

1. A ventilatingcasing around or contiguous to the smoke-pipe or funnel,substantially as set forth, so that the Ventilating-current of air maybe induced by the heat of the smokepipe, as set forth. l

2. Extending the ventilatingcasing above the top of the smoke-pipe orfunnel to increase the rapidity of the escape of the products ofleaif'ingan air-space, as set forth, said casing;`

combustion from said smoke-pipe, as set fort-h. 3. A partition or hoodextending down in front of the furnace at a short distance from thesame, in combination with thc Ventilating'- casing around thesmoke-pipe, as specified.

4. Inclosing the boiler in a. casing made of sheet metal a short;distance from said boiler7 being removable in sections,- as specified.

Dated this 21st day of September, A. D. 1865.

J. G. WOODWARD. Witnesses UHAs. H. SMITH, GEO. D. WALKER.

